He says it's downloaded in memory and I assume that it's also remaped in memory so imprec won't help as it works only with existing images. Dirty hack to force imprec to use it would be to make extra LDR_DATA_TABLE_ENTRY which would describe this dll, and which imprec can see. Other way, which I would suggest is using custom import rebuild library, and one example you may find in http://deroko.phearless.org/GenericUnpacker.rar where for scanning imports you would specify start/end of this dll and let library to do the task for you, however you will need to extract usable code on your own (and I can help you with this) and write own tool to fix dump.